Beefy Boxes and Bandwidth Generously Provided by pair Networks
more useful options
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

You say the approach you are using is "not working", leaving us to guess what data you are using and what result you expect.

My guesses are that either you want to count the number of strings in a dataset (i.e., an array) in which a pattern occurs at least once, or you want to count the total occurrences of a pattern in all strings in a dataset.

The code you posted seems to serve for the first purpose. A variation using map seems to take care of the other. (Note that the pattern occurs twice in 'zAAzAAz'.) In neither case is the original dataset changed.

>perl -wMstrict -le "my @FMat; my @dipept = qw(xAAx yAAy xyzzy zAAzAAz zzzz); ;; $FMat[0][0] = grep(/AA/, @dipept); print qq{grepped: $FMat[0][0]}; ;; $FMat[0][0] = map /AA/g, @dipept; print qq{mapped: $FMat[0][0]}; ;; print qq{@dipept}; " grepped: 3 mapped: 4 xAAx yAAy xyzzy zAAzAAz zzzz

Update: Do we need to consider the question of overlapping versus non-overlapping pattern matches? I.e., How many matches are there in 'xAAAx'?


In reply to Re: Using grep in a scalar context by AnomalousMonk
in thread Using grep in a scalar context by newbie1991

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • Outside of code tags, you may need to use entities for some characters:
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others musing on the Monastery: (18)
    As of 2014-08-27 13:16 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The best computer themed movie is:











      Results (238 votes), past polls